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Common Shingle Application Mistakes

All successful roof projects require that the installers adhere to proper application methods. Improper workmanship contributes to a decrease in the roof systems service life. All types of roof systems — both steep-slope and low-slope applications — are prone to potential workmanship errors. In the case of steep-slope shingle applications, there are a number of common mistakes that should be avoided to ensure a long service life. A successful roofing project and satisfied client can be achieved if these common mistakes can be avoided in the field.

Mistake: Leaving out the starter strip.

Problem: Does not provide proper base for shingle application.

Proper application: Starter shingles should be applied at the rake and continue along the eaves. The starter course shingles should be cut to match the exposure of the existing first course. For remedial applications on three-tab shingles, this is 5 inches; for new construction, it is 9 inches. Trim approximately 6 inches off the length of the first shingle to offset or stagger the shingles from the first full course. Application should be in accordance with the shingle manufacturer’s latest printed specifications.

Mistake: Shingles do not overhang at the eaves.

Problem: Could contribute to roof blow-off.

Proper application: The shingles should overhang the eaves and the rakes by a minimum of 1/2 inch. There should be a 1/16-inch spacing between the shingles. Nailing should be completed 3 inches above the eaves using the proper amount of nails for the geographic wind zone.

Mistake: Improper shingle alignment.

Problem: Not aesthetically pleasing.

Proper application: Shingle alignment — both vertical and horizontal — is required. The best way to ensure that the shingles are horizontally aligned in new applications is by the use of a chalk line. On recover applications, the new shingles should be aligned and butted with the existing shingles. Set horizontal chalk lines every 10 inches from the bottom of the first course up the ridge. Set vertical chalk lines every 36 inches from the roof ridge to an end of every shingle along the first course.

Mistake: Improper shingle nailing.

Problem: Potential for roof blow-off.

Proper application: Install the proper amount of shingles required by the manufacturer in the specific geographic wind zone. Most three-tab shingles require four nails in typical applications and six nails in high-velocity wind zones. The placement of the nails is as important as the number of nails. Place nails in the manufacturer’s required placement areas. Most dimensional shingle manufacturers now provide shingle placement zones. Nails should be driven straight into the deck. Nailing from an angle should be avoided, and nails should penetrate through the deck a minimum of 3/4 of an inch. Standard roofing nails have barbed shanks and are typically 11-gauge or 12-gauge nails with heads from 3/8 to 7/16 of an inch in diameter.

Mistake: Use of asphalt-based cements for shingle repairs.

Problem: Incompatible materials will contribute to further shingle delamination.

Proper application: Asphalt-based cements should only be applied at the underside of shingles. Deteriorated shingles that show evidence of curling, cracking, splitting or openings should be replaced with new shingles.

Mistake: No underlayment application.

Problem: Roof leaks.

Proper application: Application of underlayment provides benefits to the roof system at the deck and shingle components. These benefits add to the long-term weatherproofing success of the roof system. Another primary reason for their use is that most building codes require the application of underlayments on steep-slope roofs. Underlayments are also required on lower slope (2:12 to 4:12) shingle applications. It is imperative that contractors familiarize themselves with the codes in their work areas. Installations that are not completed in accordance with codes can be very costly to remedy, particularly in this case where the remedy would include the removal of the steep-slope covering.
 
Underlayments serve as a weatherproofing barrier, protecting the deck from moisture prior to shingle application, and they can be applied to dry in the roof in advance of the shingle installation. This is of particular importance on new construction projects where there can be a lengthy lapse between deck installation and shingle application. Moisture absorption in the deck could lead to delamination or warping of the deck surface, providing an unsuitable long-term substrate.
 
In the completed system, the underlayment provides secondary protection against moisture infiltration. It prevents moisture from entering into the interior spaces if the shingles are lifted, displaced or torn. The underlayment also provides added protection to the applied shingles by separating the contact of wood resins and the shingles. Some wood resins can have an adverse effect on the shingles, contributing to deterioration over time. Underlayments also serve in leveling the deck by bridging over any slight irregularities and creating a flat and even surface for the shingle application.

Mistake: Improper termination of penetrations.

Problem: Roof leaks.

Proper application: Most residential roofs have soil stacks that require proper terminations. Apply shingles up to the vent pipe and cut an opening in the shingle that is set over the pipe. Set the shingle in an approved asphalt cement. Set the vent flange over the pipe — flat on the roof — in asphalt cement that has been evenly applied over the bottom shingle. Resume shingle application and set the successive courses around the pipe. Upper and side shingles that overlap the vent should be set in asphalt cement. The asphalt cement should be applied in an even application in moderation. Do not apply asphalt-based cement over the top of the shingle. Excessive asphalt cement application may cause blistering.
 
*Information above provided by roofingcontractor.com

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13119 Foster Ct
Carmel , MN 46033
Millstream Construction
219 Naubuc Ave
East Hartford, CT 06118
Turtle Roofing
8404 Sterling St #1
Irving, TX 75063
All Around Roofing and Exteriors Inc
1440 South Monroe St
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Harmony Home Improvement
2389 Main St
Glastonbury, CT 06033
Johnson Construction Company LLC
5357 Broadview Rd. Unit B
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Bone Dry Roofing
4715 Lima Rd
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Roofs By Rodger
210 Sheridan St.
Longview, IL 61852
New Look Builders
3931 Blue Bird Rd
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Christian Brothers Roofing & Contracting, LLC
260 E Crossville Rd, Roswell, GA 30075, US
Roswell, GA, GA 30075
Contract Exteriors
1991 Glenns Bay Rd #200
Myrtle Beach, SC 29575
Seci Construction Inc
157 Robin Hood Rd
Clifton, NJ 07013
American Dream Home Improvement - Illinois
3040 Finley Rd #200
Downers Grove, IL 60515
Seneca Creek Home Improvement LLC
9909 Mainsail Dr
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Klaus Larsen LLC
61 L Main St,Hebron, CT 06248
Hebron, CT, CT 06248
LeafGuard by Midlands Home Solutions
10416 Chandler Cir
La Vista, NE 68128
Hustad Companies Inc
3236 County Hwy N
Cottage Grove, WI 53527
Solution Roofing
77 W 200 S
#122
Salt Lake City, UT 84101
Johnson Construction Company LLC
545 Metro Place S Suite 100
Dublin, OH 43017
Intech Equipment & Supply
1921 W. Grant St.
Phoenix, AZ 85009
A-Top Roofing & Construction
77 Pension Road
Manalapan, NJ 07726
Chase Construction North West Inc
11316 36th St E
Edgewood, WA 98372
Scholar Painting LLC
2 Klarides Village Drive
#145
Seymour, CT 06483
Roof Worx LLC
12301 N Grant Street
Suite 130
Thornton, CO 80241
Precision Roofing Inc
22 Kerr Lane
Southfields, NY 10975
Shield Roofing & Construction LLC
200 Hale St
Charleston, WV 25301
Smart Care Exteriors
87 Main Street
Monroe, IL 06468
Colorado Roof Toppers
131 Hunters Cove Rd
Mead, CO 80542
Allstate Roofing
2264 Fair Oaks Blvd Suite 204
Sacramento, CA 95825
DePalma Construction Inc
29 Tannery Rd
Dillsburg, PA 17019
Art Construction of NW FL, LLC
11 West 23rd Street
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Panama City, FL 32405
Net Roofing
2525 W. Arkansas Ln
Arlington, TX 76010
Pitts Roofing
3917 Broadway Ave
Fort Worth , TX 76117
Total Roofing & Reconstruction
3412 Langley Cir
Plano, TX 75024
Bone Dry Roofing
11368 Dorsett Rd
Maryland Heights, MO 63043
ABC Roofing Inc
624 Guilford College Rd
Greensboro, NC 27409
contractingPRO
9277 Cordova Park Rd
Cordova, TN 38018
RSG Roofing LLC
5648 Eula Ave
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Epic Roofing & Exteriors Ltd.
2435 22 St NE
2435 22 St NE
2435 22 St NE
Calgary, AL AB T2E 8K8
Summit Point Roofing
6352 E Fulton St
Ada, MI 49301
BOLT Construction and Roofing
746 Hanley Ind. Ct
Brentwood, MO 63144
Rocky Mountain Snow Guards, Inc.
2055 S Raritan Street, Unit B
Denver, CO 80223
Olneya Restoration Group
1887 Craig Road
St. Louis, MO 63146
Mallard Construction & Roofing
3601 S I-35 Service Rd,Oklahoma City, OK 73129
Oklahoma City, OK 73129
Crescent Movers
6321 N. Cicero Ave, Unit A
Chicago, IL 60646
Hooten Homes LLC
103 West 4th St.
Wentzville, MO 63385
Total Roofing & Reconstruction
13332 Bee Street
Dallas, TX 75234
Infinity Home Improvement Inc
852 47th St SW
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p.o.box 2183
pocono pines, PA 18350
Johnson Construction Company LLC
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STE N1-315
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Roof Worx LLC
155 E Boardwalk Drive
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Drytech Restoration Services
80 Central Ave.
Spring City, PA 19475
TCK Roofing
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Elstree Road
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Meredith Home Improvements
2025 Borland Road
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Tredent Contracting Services
237 46th street
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Gemini General Contracting
121 South Walnut Street
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A.Clark roofing and siding
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My-Pros roofing
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234 Azores Dr
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Southern Home Services LLC
9307 Monroe Rd
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The Roof Maker Inc
38 Mercer Street
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Pennington Roofers
3433 Highway 190 Suite 105
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Roofing & Restoration Services of America
1605 E Terra Ln.
O'Fallon, MO 63366
Pacific Exteriors LLC
14724 Bothell Way NE,Seattle, WA 98155
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American Dream Home Improvement - Indiana
11711 N Pennsylvania St #105
Carmel, IN 46032
Johnson Construction Company LLC
1707 N West St.
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